Would all depend on tank locations. My Black and Gray are in the drop down frame section, while my Galley is up in the belly, thus my Galley is 10" higher than either my Gray or Black. But I just use my Black Tank flusher, multiple flushes.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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